The Mobile Fortress is a Tier VI Ship and requires a level 26 Shipyard to build.
The Mobile Fortress has 80 Million Base HP, 1 Base Speed, and 1,180,000 Attack. It costs 200.000 Credits, 200.000 Ore, and 100.000 Energy to build.
It has a base build timer of 49 hours and 20 minutes. (49:20:00) To use a mobile fortress, it requires a hero with at least 400 command. The Mobile Fortress adds 25M to your army, and only one can be active per player at a time.
To be reinforced my an MF, your current total army must be at 125m or above.